Hi Lup, Nice to know you found the issue (and Linux errata for T-Head C906 helped), that BUG is really strange.
Probably a similar issue could exist on MILK-V board too. Did you test NuttX on Sipeed M1s Dock AI + IoT BL808 RISC-V? Unfortunately Pine 0x64 doesn't ship to Brazil (probably many buyers let the boards return after getting notified of higher taxes from Brazilian Customs). Best Regards, Alan On Sat, Dec 9, 2023 at 8:11 PM Lee, Lup Yuen <lu...@appkaki.com> wrote: > Last week we walked through the Serial Console for Pine64 Ox64 BL808 64-bit > RISC-V Single-Board Computer. And we hit some illogical impossible problems > on NuttX for Ox64: > > (1) Console Input is always empty. (Can’t enter any Console Commands) > (2) Interrupt Claim is forever 0. (Ox64 won’t tell us which Interrupt was > fired!) > (3) Leaky Writes are mushing up adjacent Interrupt Registers. (Or maybe > Leaky Reads?) > > Today we discover the One Single Culprit behind all this rowdy mischief: > Weak Ordering in the MMU! (Memory Management Unit) > > Here’s how we solved the baffling mystery: > https://lupyuen.codeberg.page/articles/plic3.html > > Lup >
